return false;
        }

        return process(thumbnailId, responseData -> {
            if (!isImageMimeType(responseData)) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Thumbnail is not image: {} : {}", thumbnailId, responseData.getUrl());
                }
                updateThumbnailField(thumbnailId, StringUtil.EMPTY);
                return false;
            }

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String thumbnailId = DocumentUtil.getValue(docMap, fessConfig.getIndexFieldId(), String.class);
        final Tuple3<String, String, String> task = new Tuple3<>(getName(), thumbnailId, path);
        if (logger.isDebugEnabled()) {
            logger.debug("Create thumbnail task: {}", task);
        }
        return task;

        @Override
        public String getName() {
            return "TestGenerator";
        }

        @Override
        public boolean generate(String thumbnailId, File outputFile) {
            // Validate inputs
            if (thumbnailId == null || thumbnailId.isEmpty() || outputFile == null) {
                return false;
            }

            // Check if parent directory is writable

        // Test that generate always returns false
        File outputFile = new File("test.jpg");
        assertFalse(emptyGenerator.generate("thumbnailId", outputFile));
        assertFalse(emptyGenerator.generate(null, outputFile));
        assertFalse(emptyGenerator.generate("thumbnailId", null));
        assertFalse(emptyGenerator.generate(null, null));
    }

    public void test_destroy() {
        // Initialize without container

        private boolean generateCalled = false;
        private boolean destroyCalled = false;

        @Override
        public boolean generate(String thumbnailId, File outputFile) {
            generateCalled = true;
            return true;
        }

        @Override
        public void destroy() {
            destroyCalled = true;
        }

            systemProperties.reload(options.propertiesPath);
        } else {
            try {
                final File propFile = ComponentUtil.getSystemHelper().createTempFile("thumbnail_", ".properties");
                if (propFile.delete() && logger.isDebugEnabled()) {
                    logger.debug("Deleted a temp file: {}", propFile.getAbsolutePath());
                }

        boolean generateCalled = false;

        @Override
        public String getName() {
            return "testGenerator";
        }

        @Override
        public boolean generate(String thumbnailId, File outputFile) {
            generateCalled = true;
            return generateResult;
        }

        @Override
        public boolean isAvailable() {
            return available;
        }